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Periodic table development and arrangement

Atomic structure and periodicity · Lesson 4 of 5

Lesson 4 of 5

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Lesson 4 of 5 · Atomic structure and periodicity

Periodic table development and arrangement

3 quick checks≈2% of the testFoundational

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By the end you’ll be able to

describe the periodic table as an arrangement of elements in order of increasing atomic number
explain how elements with similar chemical properties are placed in the same group and how rows are arranged into periods
describe key stages in the development of the periodic table, including early attempts to classify elements and Mendeleev’s contribution

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evaluate why the discovery of protons and the use of atomic number led to the modern periodic table

relate the group number and period number of main-group elements to the number of outer-shell electrons and occupied shells respectively

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